Method of producing a slurry of lime in oil



Sept. E5, 1931. E. E. BARTELS 1,323,582

METHOD OF PRODUCING A SLURRY OF LIME IN OIL Filed July 9, 1927 @mail lI6 D 6 0 0 El u) llllllllllll-IIIIII sf '714155141441010 Y:

` Man Patented Sept. 1.5,

NETA@ EDWARD E. BARTELS, OF WHITING, INDIANA, ASSIGNGR T STANDARD OILCOMPANY,

0F "WRITING, INDIANA, A

CORPORATION 0F INDIANA Application. filed July 9,

This invention relates to a method of producing a slurry of lime in oil,particularly hydrocarbon oil which is to be subjected to distillation orcracking.

The present invention will be readily understood from the followingdescription in conjunction with the accompanying drawing which showsdiagrammatically a sectional elevation of a suitable apparatus for thispurpose.

Referring to the drawing, is an open tank provided with a supplyandwithdrawal line 11.` a perforated air pipe 12 in the lower po-rtionthereof, and a pipe 13 which extends from a point near the bottom of thetank to the suction side of a pump 14. From the pressure side of thepump 14, extends a pipe 15 which terminates in a nozzle 16 which islocated in a collar 17 which carries a hopper 18. The bottom of thehopper 18 opens into the collar 17 at 19, adjacent the extremity of thenozzle 16. A pipe 20 extends from the collar 17 and terminates in anopen end 21 in the upper part of the tank 10. This open end 21 ispreferably provided with a strainer 22. The pipe 20 is so located withrespect to the nozzle 16 that the oil emitted by said nozzle isprojected into said pipe, drawing with it lime or other material whichis supplied in the hopper 18. The pipes 15 and 20 are provided withvalves 28 and 24 and are connected by a pipe 25, provided with a valve26, to permit the nozzle 16 to be by-passed.-

ln operating the process, the tank 10 is filled, or largely filled, withoil which is circulated from the bottom of the tank 10 by pump 14through pipes 13, 15, nozzle 16, and pipe 20, back to the tank 10.Powdered hydrated lime is dumped into the hopper 18 and is drawn intothe stream of oil issuing from nozzle 16 and carried thereby into thetank 10. While operating in this manner. air is injected by the pipe 12to keep the oil in a. state of agitation and prevent settling of thelime. T he. strainer 22 removes foreign bodies which may find their wayinto the lime. After the requisite quantity of lime has been supplied, asuitable quantity of water is supplied by pouring it into the hopper 18and allo-wing it to be brought into the 1927. serial no. 204,435.

tank l0 by the circulation described. This addition of wat-er and thethorough admixture. thereof with the oil aids materially in theproduction of a relatively stable suspension of lime in the oil. Whiledrawing o the oil for use, it is preferred to inject air through pipe 12and to circulate the slurry by pump 14 through lines 13, 15, 25 and 20,the valves 23 and 24 being closed and valve 26 being open.

Relatively large. quantities of lime and water may be incorporated inthe oil, if desired. For example, thelime may be present tothe extent ofup to 10% or higher and the water may suitably range between 0.25 and10%.

The invention finds an important application in the addition of lime tohydrocarbon oil which is intended to be cracked in continuous pressurestills. In this use of the invention it is preferred to mix the desiredamount of lime with a relatively small part of the hydrocarbon oilintended to be cracked under pressure to form gasoline or similarproducts, and to supply the limed portion to the main portion of thestock as it is being fed to the still.

The invention will be more readily understood from the followingspecific example:

The charging stock may suitably comprise, for exan'ip-le, gas oil,paraffin light ends, heavy pressure tar distillate, and naphthahottoms,with or without heavy paraffin distillate. The lime may suitablybe incorpovrated in a part of one constituent, for eX- ample., in a partof the heavy pressure tar distillate.

About 4,000 gallons of heavy pressure tar distillate are supplied to thetank 10 and the pump 14 started. About 7500 pounds of lime are suppliedby the hopper 18 and are thoroughly mixed with the oil by thecirculation thereof. Anout forty gallons of water are then supplied bythe hopper '18 and thoroughly mixed with the slurry. About 1,000 gallonsmore oil are supplied to the tank, air being .supplied by pipe 12 toeffect thorough admixture.

The concentration of lime in the slurry is thus approximatelyl poundsper gallon.

In order to add the requisite amount of lime to a stream of oil, it isnecessary to pump the slurry into the stream at a definite rate. Forexample, Where it is desired to supply approximately 0.5 pounds of limeper barrel of oil to stills charging 80 barrels per hour, it isnecessary to suppl a slurry of this composition at the rate oty about 27gallons per hour. This Withdrawal of slurry may be w eected through pipe11 by .a'pump (not shown). Y

Although the present invention 'has been described in connection withthe" details of i a specific example thereoi it. is .not intended thatsuch details shall be regarded as limitations upon the scope of theinvention, except in so far as included in the accompanying claims. Iclaim:

1. The method of producing a slurry of lime in petroleum oil Without thenecessity of introducing extraneous fatty acids into the oil whichconsists insupplying powdered hydrated lime to the oil and mixing ittherewith, then supplying a relatively small quantity of Water theretoand agitating.

2. The method of producing a slurry of lime in petroleum oil whichconsists in circulating the oil in a confined stream from and back to abody of oil, gradually adding lime to the circulating stream of oil andthen supplying Water to said oil.

3. The method of producing a slurry of lime in petroleum oil whichconsists in circulating oil from the bottom of a maintained body of oilto the top thereof, causing said oil to pass through a constrictednozzle during said circulation, supplying powdered hydrated lime to saidcirculating oil adjacent said nozzle whereby it is carried into saidbody of oil and distributed therethrough, and supplying a small amountof water to said circulating oil and causing it to be carried into saidbody of oil.

'4. The method of producing av slurry of lime in petroleum oil whichconsists in cyclically circulating oil in a confined stream from andback to a body of oil, gradually adding lime to the circulating streamof oil, and then supplying Water to said oil.

5. The method of producing a slurry of lime in petroleum oil whichconsists in cyclically circulating oil in a confined stream from andback to a body of oil, gradually adding lime to the circulating streamof oil, and then supplying Water to said circulating stream of oil.

6. The method of producing a slurry of lime in petroleum oil whichconsists in cyclically circulating a maintained body of oil through arestricted passageway provided with a constricted nozzle, supplying limeto"l sait passageway adjacent said nozzle Whereby lit =;is"m1Xed Withthe oil flowing through es Said restricted passageway, and supplyinglll)

